Load combobox cha con


    <td valign="top">
    <td valign="top">
        <div class="form-group">
            <select name="city" class="form-control">
                <option value="1" > TP. Hồ Chí Minh</option>
                <option value="2" > Hà Nội</option>
                <option value="3" > Đà Nẵng</option>
    <td valign="top">
    <td valign="top">
        <div class="form-group" id="selectDistrict"></div>

Continue reading

Connect với firebase

Để chạy được firebase ta cần tạo 1 acc trên firebase website. Sau khi tạo xong, thì My First App là project của chúng ta, ta sẽ test dựa trên project này. Mỗi app có 1 unique host-name riêng, ta chỉ việc dùng nó và gán vào url project chúng ta.

<!DOCTYPE html>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Firebase Chat Application</title>
    <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
        .container {
            max-width: 700px;
        #comments-container {
            border: 1px solid #d0d0d0;
            height: 400px;
            overflow-y: scroll;
        .comment-container {
            padding: 10px;
            background: #f5f5f5;
            font-size: 13px;
            -moz-border-radius: 5px;
            -webkit-border-radius: 5px;
            border-radius: 5px;
        .comment-container .label {
            margin-right: 20px;
        .comment-container:last-of-type {
            border-bottom: none;
    <div class="container">
		<h1>Firebase Chat Application</h1>
		<div class="panel panel-default">
			<div class="panel-body">
				<div id="comments-container"></div>
			<div class="panel-footer">
				<form role="form">
					<div class="form-group">
						<label for="comments">Please enter your comments here</label>
						<input class="form-control" id="comments" name="comments">
					<button type="submit" id="submit-btn" name="submit-btn" class="btn btn-primary">Send Comments</button>
					<button type="reset" class="btn btn-default">Clear Comments</button>
    <script src="https://cdn.firebase.com/js/client/1.0.6/firebase.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
    <script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
	var fireBaseRef = new Firebase("https://blinding-fire-###.firebaseio.com/"); /* firebase url */
	$("#submit-btn").bind("click", function(event) {
		var comment = $("#comments"),
			commentValue = $.trim(comment.val());
		if (commentValue.length === 0) {
			alert('Comments are required to continue!');
		} else {
			fireBaseRef.push({comment: commentValue}, function(error) {
				if (error !== null) {
					alert('Unable to push comments to Firebase!');
	fireBaseRef.on('child_added', function(snapshot) {
		var uniqName = snapshot.name();
		var comment = snapshot.val().comment;
		var commentsContainer = $('#comments-container');
		$('<div/>', {class: 'comment-container'})
			.html('<span class="label label-info">Comment ' + uniqName + '</span>' + comment)

Từ: code.tutsplus.com

Working from home

– Uể oải: phải thật sự thích công việc, không nên lười và nằm ườn ra ngủ.
– Phải có schedule:
+ Be at my desk by 09:00.
+ Admin (email, organisation) until 09:30.
+ Work til 11:00.
+ Exercise until 13:00.
+ Lunch at 13:00, until 13:30.
+ Work until 18:00.

- Phải ngủ sớm: nếu ngủ trễ thì sẽ lạc mất schedule
Continue reading

Install Config Server Firewall (CSF)


Config Server Firewall (or CSF) is a free and advanced firewall for most Linux distributions and Linux based VPS. In addition to the basic functionality of a firewall – filtering packets – CSF includes other security features, such as login/intrusion/flood detections. CSF includes UI integration for cPanel, DirectAdmin and Webmin, but this tutorial only covers the command line usage. CSF is able to recognize many attacks, such as port scans, SYN floods, and login brute force attacks on many services. It is configured to temporarily block clients who are detected to be attacking the cloud server.

The full list of supported operating systems and features can be found on ConfigServer’s website.

This tutorial is written for Debian based VPS, such as Debian and Ubuntu. The commands should be executed with root permissions, by logging in as root, or initiating a root shell with the following command if sudo is installed:

sudo su

Continue reading

Nginx Redirect Mobile to Mobile Version Of the Web Site

Nginx configurations:

set $mobile_rewrite do_not_perform;
## chi http_user_agent for mobile / smart phones ##
if ($http_user_agent ~* "(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino") {
  set $mobile_rewrite perform;
if ($http_user_agent ~* "^(1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-)") {
  set $mobile_rewrite perform;
## redirect to m.example.com ##
if ($mobile_rewrite = perform) {
  rewrite ^ http://m.example.com$request_uri? redirect;

Continue reading

Sửa lỗi VMware Workstation 9 cứ cấp IP động là 192.168.255.xxx

Vào 1 ngày đẹp trời nào đó, ta không thể connect được vmware từ client(ssh, ping) vì vmware của ta cấp phát IP động theo dòng 192.168.255.xxx. Mà theo kiến thức ta được học thì không connect được với subnet 255, vậy vấn đề có thể là IP đẹp đã bị chiếm hết, để giải quyết vấn đề trên, ta làm như sau: Continue reading